X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=bmusb%2Fbmusb.h;h=cec84d9ae6bef90c65fee708462991eea0978d8b;hb=03e38890b599efe6ac906fdb70b43cda63f11d01;hp=a484496bd6be5cd0aa83512258c0e87f75a79978;hpb=5163d25c65c3028090db1aea6587ec2fb4cb823e;p=bmusb

diff --git a/bmusb/bmusb.h b/bmusb/bmusb.h
index a484496..cec84d9 100644
--- a/bmusb/bmusb.h
+++ b/bmusb/bmusb.h
@@ -73,6 +73,22 @@ class FrameAllocator {
 	// if so, the frame in progress will be dropped.
 	virtual Frame alloc_frame() = 0;
 
+	// Similar to alloc_frame(), with two additional restrictions:
+	//
+	//  - The width, height and stride given must be correct
+	//    (can not be changed after the call).
+	//  - create_frame(), unlike alloc_frame(), is allowed to sleep
+	//    (so bmusb will never call it, but in Nageru, other producers
+	//    might)
+	//
+	// These two restrictions are relevant for Nageru, since it means that
+	// it can make frame_copy point directly into a VA-API buffer to avoid
+	// an extra copy.
+	virtual Frame create_frame(size_t width, size_t height, size_t stride)
+	{
+		return alloc_frame();
+	}
+
 	virtual void release_frame(Frame frame) = 0;
 };